CO2
- If Earth heated (global warming), CO2 would come out of solution
- carbonate rocks would decompose, giving
- 90 atmos. of CO2
Venus experienced “runaway greenhouse”
- CO2 creates greenhouse effect TA 58
- surface temperature increases
- vicious cycle of increasing CO2 and temperature
- now surface temperature is 750 K
- first measured by Venus’ radio emission
- radio waves penetrate the thick cloud cover
- confirmed by landers
- hot enough to melt lead